Towards an absolute chronology of the outer Solar System

外太阳系的绝对年表

• 批准号: 22KJ1286
• 负责人: WONG WAI EMILY
• 金额: $ 1.41万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22KJ1286/
• 关键词: Outer solar system; Icy satellites; Crater chronology; Giant planet migration; Cratering chronology; Planet migration; Impact flux; Impact probability

This study aims to determine the age of the giant planets' regular satellites and the cratering/impacting rate of the outer solar system. Our recent efforts have focused on the icy regular satellites of Saturn. To achieve this, we used high-resolution outer solar system evolution simulations and improved estimates of the number of trans-Neptunian objects from the literature. This enabled us to calculate model surface ages of the most heavily cratered terrains on icy satellites, which have implications for understanding the formation and tidal evolution of these satellites.We found that the surface ages of the cratered plains on Mimas, Enceladus, Tethys, Dione, and Rhea range from 4.1 Ga to 4.4 Ga, with the surfaces of Mimas and Enceladus being roughly 200 million years younger than the outer three satellites. The calculated model surface ages are consistent with the idea that Saturn's regular satellites are ancient and have implications for their formation and tidal evolution. This work provides updated isochrons (please refer to the figures) for the observed crater size-frequency measurement of the icy satellites and supports the current understanding of the satellites' formation and evolution.

这项研究旨在确定巨型行星的常规卫星的年龄以及外太阳系的碎屑/撞击率。我们最近的努力集中在土星的冰冷常规卫星上。为了实现这一目标，我们使用了高分辨率的外部太阳系演化模拟，并改善了文献中跨纳普对象数量的估计。 This enabled us to calculate model surface ages of the most heavily cratered terrains on icy satellites, which have implications for understanding the formation and tidal evolution of these satellites.We found that the surface ages of the cratered plains on Mimas, Enceladus, Tethys, Dione, and Rhea range from 4.1 Ga to 4.4 Ga, with the surfaces of Mimas and Enceladus being roughly 200 million years younger than the外三卫星。计算出的模型表面年龄与土星常规卫星是古老的想法一致，并且对它们的形成和潮汐进化具有影响。这项工作提供了更新的等边（请参阅数字），以了解冰冷卫星的观察到的火山口尺寸频率测量，并支持对卫星形成和进化的当前理解。

项目成果

From modelled crater chronology of the outer solar system to the absolute ages of Enceladus' terrain.

从外太阳系的模拟陨石坑年表到土卫二地形的绝对年龄。

• 发表时间: 2022
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong
• 通讯作者: Emily Wong

Early impact chronology of the icy regular satellites of the outer solar system

• DOI: 10.1016/j.icarus.2020.114184
• 发表时间: 2020-11
• 期刊: Icarus
• 影响因子: 3.2
• 作者: E. W. Wong;R. Brasser;S. Werner

From modelled crater chronology of the outer solar system to the absolute ages of Enceladus' terrain

从外太阳系的模拟陨石坑年表到土卫二地形的绝对年龄

• 发表时间: 2021
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong;Wong Wai Emily;Wong Wai Emily;Wong Wai Emily
• 通讯作者: Wong Wai Emily

Exposing the icy moon's secret age using model crater chronology of the outer solar system

利用外太阳系陨石坑年表模型揭示冰冷卫星的秘密年龄

• 发表时间: 2022
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong
• 通讯作者: Emily Wong

Model surface ages of the icy satellites in the outer solar system

太阳系外冰卫星的表面年龄模型

• 发表时间: 2021
• 作者: Wong Emily W.;Brasser Ramon;Werner Stephanie C.;Emily Wong;Emily Wong;Emily Wong;Wong Wai Emily;Wong Wai Emily
• 通讯作者: Wong Wai Emily